超低能碰撞猝灭：用内态选择控制效率
Collisional Quenching at Ultralow Energies: Controlling Efficiency with Internal State Selection
摘要：
计算了激发态H $_2$分子与Li $^+$离子在超低能碰撞时的振动猝灭。的动力学已被完全使用众所周知的量子耦合通道扩展在不同的初始振动水平。整体的相互作用势已经从我们小组早期使用高度相关的从头计算方法进行的计算中获得。结果表明，散射观测量的特定特征，如弹性通道截面中Ramsauer-Townsend极小值的出现和从特定初始状态开始冷却速率的显著增加，可以与能量消失时的势能性质（散射长度的符号和大小）以及虚态或束缚态的存在联系起来.建议通过选择分子伴侣的初始状态制备，离子相互作用将能够在超低能量下控制猝灭效率。
英文摘要：
Calculations have been carried out for the vibrational quenching of excited H$_2$ molecules which collide with Li$^+$ ions at ultralow energies. The dynamics has been treated exactly using the well known quantum coupled-channel expansions over different initial vibrational levels. The overall interaction potential has been obtained from the calculations carried out earlier in our group using highly correlated ab initio methods. The results indicate that specific features of the scattering observables, e.g. the appearance of Ramsauer-Townsend minima in elastic channel cross sections and the marked increase of the cooling rates from specific initial states, can be linked to potential properties at vanishing energies (sign and size of scattering lengths) and to the presence of either virtual states or bound states. The suggestion is made that by selecting the initial state preparation of the molecular partners, the ionic interactions would be amenable to controlling quenching efficiency at ultralow energies.
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